You can see three almost identical images below. Can you spot the odd one out from them?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Solve the following series:
AZ, GT, MN, __, YB

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What four weights can be used to balance from 1 to 30 pounds?

The dirtier I get, the whiter I look. Who am I?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?